हिंदी

Identify the figure and give its use.

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प्रश्न

Identify the figure and give its use.

Identify a figure and write one use of it:

वर्गीकरण करो
लघु उत्तरीय
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उत्तर

Figure: Cartridge type fuse/Electric fuse

Uses: 

  1. It is a safety device that protects the wiring from overheating caused by an excessive current supply.
  2. It melts when a high current travels through the circuit, causing the circuit to break and the current to stop flowing through it.
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अध्याय 4: Effects of electric current - Exercises [पृष्ठ ६१]

APPEARS IN

बालभारती Science and Technology Part 1 [English] Standard 10 Maharashtra State Board
अध्याय 4 Effects of electric current
Exercises | Q 11.1 | पृष्ठ ६१

संबंधित प्रश्न

Compute the heat generated while transferring 96000 coulomb of charge in one hour through a potential difference of 50 V.


An electric heater of resistance 8 Ω draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater.


Write Joule's law of heating.


An electric heater is connected to the 230 V mains supply. A current of 8 A flows through the heater. 

(a) How much charge flows around the circuit each second?


Why does the connecting cord of an electric heater not glow hot while the heating element does?


Name the material which is used for making the filaments of an electric bulb.


The current passing through an electric kettle has been doubled. The heat produced will become:

(a) half
(b) double
(c) four time
(d) one-fourth 


An electric fuse works on the:
(a) chemical effect of current
(b) magnetic effect of current
(c) lighting effect of current
(d) heating effect of current


Which electric heating device in your home do you think have resistors which control the flow of electricity?


Give a scientific reason.

Tungsten metal is used to make a solenoid type coil in an electric bulb.


Give Scientific reason
In the electric equipment producing heat e.g. iron, electric heater, boiler, toaster etc, an alloy such as Nichrome is used, not pure metals.


Give a scientific reason:

For electric power transmission, copper or aluminium wire is used.


Give Scientific reason.

In practice, the unit kWh is used for the measurement of electrical energy, rather than joule.


An electric iron of 1100 W is operated for 2 hrs daily. What will be the electrical consumption expenses for that in the month of April? (The electric company charges Rs 5 per unit of energy).


Answer the following question:
what is the heating effect of the electric current? state any four applications of it?


Which of the following substance contracts on heating?


What is the heating effect of electric current?


Live wire and neutral wires have a 220 V potential difference.


Name any two appliances which works on the phenomenon of heating effect of electric current.


How can overloading be avoided?


Explain the application of heating effect of electric current in an electric bulb with a diagram.


True or False – If False give the correct answer

The fuse wire does not melts whenever there is overload in the wiring.


Explain the heating effect of electric current.


Which of the following is correct?


Assertion: Bending of wire decreases the resistance of the electric wire.

Reason: The resistance of a conductor depends on length, thickness, nature of material and temperature of the conductor.


An electric kettle consumes 1 kW of electric power when operated at 220 V. A fuse wire of what rating must be used for it?


B1, B2 and B3 are three identical bulbs connected as shown in Figure. When all the three bulbs glow, a current of 3A is recorded by the ammeter A.

  1.  What happens to the glow of the other two bulbs when the bulb B1 gets fused?
  2. What happens to the reading of A1, A2, A3 and A when the bulb B2 gets fused?
  3. How much power is dissipated in the circuit when all the three bulbs glow together?

 


What is Joule’s heating effect? How can it be demonstrated experimentally? List its four applications in daily life.


(a) Observe the diagram given below and state whether the bulb will glow or not when we switch on K.

(b) Is it safe to handle the bulb when the switch is OFF?

(c) Give a reason for your answer in (b).


What is a trip switch?


An electric fuse is a wire made up of a material having ______ melting point.


The electric fuse works on the Joule heating principle.


Explain why fuse wire is always connected in a series arrangement.


Tara, after completing her exams, went to her grandmother's house along with her younger brother Rahul. One day, Rahul came home after playing and switched on the fan and air conditioner. At the same time, his grandmother was preparing a milkshake for him using a mixer. Suddenly, they heard a big sound and the electricity of the house got shut down. Tara is called an electrician. He said the main reason for supply to shut down was overloading.

  1. What is overloading?
  2. Is overloading and short the same? When does short-circuiting take place?
  3. How can the effects of overloading be avoided?

Find the odd one out.


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